Nut-lock



Patented Feb. 8, 1921.

ODWARD.

' UT LOCK.

APPL man FEB. 13. 1919.

UNiTtiiI GFFICE.

IRVING C. WODVIARD, OF CHICAGO, ILLNOIS, rLSSIGll'OR T GEORGE B1. TURLEY, OF CHlG-O, ILLNOIS.

NUT-LO CK.

Leccese.

Application filed February 13, 1919.

To all fte/tom may concern Be it lrnown that l, lRvrNc C. lVooDwAno, a citizen orf the United States of America, and a resident of Chicago, county ot Cook, and State of lllinois, have invented certain new and useiul Improvements in Nut-Locks, of which the following' is a speciiication.

rlfhe invention relates to loch-nuts of the `general character described in Patents Nos. 1,137,9/11 and 1,175,034, respectively dated May i1, 1915 and March 1li, 1916, and granted to the present applicant. Each oi" the said patents describes a threaded nut or other holding member having a thread oit standard form but which is coated with a material which is relatively softer than that of which the holding member is formed. In the nut shown in Pat. No. 1,137,941, the coating` of soft material is cut away from most of the convolutions ot the thread excepting a few at one end of the nut. The purpose of so cutting away most of the coating' ot soft metal was to permit easy application of the nut to a threaded bolt while providing' with such coating` of sott metal which remained, means for causing the nut to irmly grip orstick to the threads ot the bolt and avoid the objection of common -forms of threaded holding' devices., that they are liablel to become accidentally jarred or vibrated loose from the coactiirg` threaded holdin@n member.

In liat. No. 1,175,934, the same end was accomplished by removing the coatingof soft material from one side only oit the thread. This resulted in a thread having a binding surface on one side and on the other side a harder surface for receiving; the reacting pressure from whatever is held in place by the nut. The coating of sott material was applied preferably by dipping the nut in some amalgam oi' lead, tin, or zine, and this method of applying soft material necessitated the rez-cuttingo1 the thread to remove the excess part of the coating.

The objects of the present invention are in general the same as with the patented devices, but the desired results are attained by a somewhat simpler design, and the re-cut nut may be produced by a threading,- tool which departs from the normal design ot threading tools but slightly.

Specification of Letters Patent.

Patented Feb. 8, 1921.

Serial No. 276,802.

l.to a bolt.

Fig. 4 is a view of portionof a tap having' its teeth ground down so as to be suitable for removing; from the threads oi the nut the excess coating` of soft material.

The objects of the invention are attained by providing a holding member such as the nut lwvith any one ci the usual standard threads 2 and then coating said threads with a soft material 3 and finally cutting away most of the soft material :trom the sides ot the thread excepting;` the pad portion et thereof forming a flat-faced interdental iilling` between the bases of the threads. Before the coating` is applied, the nuts are cleaned by dipping; in caustic soda or sulfuric acid solutions, the threads are tinned or otherwise prepared, and then the coating is applied, preferably by dipping the articles in molten sott metal. The excess coating is removed by means of a tool such as the tap 5 shown in Fig. el. rihis tap, with the eX- ception that the outer edges 6 of the teeth 7 are ground down, is identical in design with the tap which originally cut the thread 9.. When the finished nut is applied to a' bolt, as shown in Fig. 3. the soft metal 4- is spread apart as indicated in this figure, and due to the pressure created therein, forms a bindingmaterial oiiering` considerable frio tional resistance to removal ot the nut from the bolt.

The type ot thread illustrated is the U. S. standard, having a sixty-degree angle and beingslightly flat at its apex and between the bases ot the convolutions of the thread. The invention is carried out in the same manner as above described in connection with other types of thread wherein there is more or less flat, or in connection With rounded threads.

Although but one Specific embodiment of this invention has been herein shown and described, it Will be understood that numerous details of the construction shown may be altered or `omitted Without departing from the spirit of this invention as defined by the following claim.

I claim:

A threaded holding member of the class described, wherein the interdentals at their apices only are filled with a softer metal than that of which the body of the holding member is formed.

Signed at Chicago this 4th dey oi' Dec.,

IRVING C. WODWARD. 

